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JUNE 2016 ISSUE: 80
Developed by Investec Property.
SA R36 EACH INCL. / R360 PER ANNUM INCL.
© Peter Hassall
25 YEARS of EXCELLENCE WORLD CLASS METAL ROOFING SYSTEMS
VISIT OUR NEW PREMISES: Mega Park, Unit MP58, cnr Peter Barlow & Mill rd, Bellville South, CT OR CONTACT US: CALL 021 951 1036 or EMAIL dion.marsh@ashandlacy.com
BESPOKE ROOFING FASTENERS FOR SOUTH AFRICA
JUNE 2016
ISSUE: 80
EDITOR’S COMMENTS................................................................................................. 2 CONTRIBUTORS & EVENTS....................................................................................... 4 INSULATION............................................................................................................... 7-9 COVER STORY.........................................................................................................11-12 BULK INSULATION............................................................................................... 14-15 TIMBER FASTENERS.............................................................................................. 17-20 INDUSTRY EVENT....................................................................................................... 21 PRODUCT NEWS.........................................................................................................22 EPDM..........................................................................................................................26-27 SAFETY EQUIPMENT............................................................................................ 29-31 ROOFTOP MANAGEMENT.......................................................................................33 INSULATION.......................................................................................................... 34-35 MAINTENANCE, PAINTS & COATINGS.........................................................36-39 LIGHTING.......................................................................................................................39 TIMBER TRUSSES................................................................................................... 40-41 INDUSTRY INSIGHT..............................................................................................42-43 ITC-SA EVENT...............................................................................................................43 WATERPROOFING......................................................................................................45 CEILINGS & INSULATION.........................................................................................46 WATERPROOFING......................................................................................................47 INDUSTRY EVENT.......................................................................................................48
Trademax Publications SA Roofing Tel: 0861 SA ROOF (0861 727 663) Fax: 0866 991 346 Email: info@trademax.co.za www.trademax.co.za Postnet Suite 241 Private Bag X103 N1 City 7463
PUBLISHER: Billy Perrin 082 266 6976 billy@trademax.co.za EDITOR: Celéste Perrin editor@trademax.co.za ADVERTISING: Jacqui Marsh jacqui@trademax.co.za
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LAYOUT & DESIGN: Craig Patterson craig@trademax.co.za SUBSCRIPTIONS: Belinda Thwesha belinda@trademax.co.za
DISCLAIMER The views expressed herein are not necessarily those of Trademax Publications. Although we have done our best to ensure the accuracy of our content, neither Trademax Publications nor SA Roofing magazine will be held liable for any views expressed or information disseminated, in editorial content or advertisements, in this issue.
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EDITOR’S COMMENTS
A chilling prospect... This imminent winter, that is. Sliding out of May and into June, we’re right on the cusp of the dreary season. And judging by the frosty early mornings of the past few days, Mother Nature is already making sure that this winter will go down as another cold one.That brings to mind the tenet that it is never too early, nor too late, to insulate.
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s such, the recent release of the TiPS Guidebook on Thermal Insulation and Energy Saving by TIPSASA (Thermal Insulation Products & Systems Association SA) could not have been more timely. SA Roofing, in this issue as well as future editions, will be sharing with you pertinent information and guidelines to help you select the right insulation products and systems that support energy efficiency in the building envelope. To start, don’t miss this month's three expert articles that address insulation and energy savings.
It’s hard to believe that we’re already facing the second half of this year, but we still have a number of industry events to look forward to that will also help keep the channels of communication open, including WoodEx for Africa, Interbuild Africa 2016, and the Cape Construction Conference and Trade Expo. It’s not too late – SA Roofing is going to be there, and we invite you to partner with us to position and maintain your product or service at centre stage in these tough times when being noticed counts more than ever.
In contrast to the other hot topics also featured in this issue stands the unfortunate arctic factor that we all have to contend with currently – our economic climate. But it is because of icy trading conditions, and despite them, that we have to keep doing what we do best – and we have to ensure that our target audience knows about it. SA Roofing is here to help with that.
Until next time, I hope you enjoy this issue of SA Roofing, packed with information to take the chill off winter. As always, feel free to drop me a line with your comments, suggestions or feedback. Celéste
JUNE 2016
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AUTHORIZED DISTRIBUTOR OF LAMBDABOARD AND PALRAM TRANSLUCENT SHEETING Cnr Berkley and Bax Roads, Maitland 7405
New Youngman premises: Architecture by Martin Commerford of DHA and interiors by Leon Saven Design
CONTRIBUTORS & EVENTS
Contributors HEIN STAPELBERG With three degrees under his belt, Hein Stapelberg believes in the power of logic and sensibility – traits that have equipped him to successfully oversee operations at Gauteng-based Fall Protection Works (which he co-owns), leading provider of customized and turnkey fall prevention and protection systems that ensure the safety of those working at height. Stapelberg is primarily responsible for the processes, research and administration that drives Fall Protection Works and its services, and comments that he has seen much change in the industry since his introduction to work at height back in 1999. He maintains his professional work at height qualifications through continued, hands-on engagement and participation on his company's active worksites. Committed to remaining at the forefront of research, development and international trends within the industry in order to bring this knowledge to market, Stapelberg actively collaborates with organizations such as the Institute for Work at Height (IWH), the South African Bureau of Standards (SABS), the International Organisation for Standardisation (ISO), and the Industrial Rope Access Trade Association International (IRATA).
DION MARSH Dion Marsh holds a National Diploma in Quantity Surveying and Construction Management. Involved in the roofing industry for close to 25 years already, his extensive experience ranges from contracting to manufacture and supply. More specifically, he has served as a member of the SAMCRA Technical Committee (the Southern African Metal Cladding and Roofing Association) and also as a member of the SANS1273 Working Group. As the General Manager of Ash & Lacy South Africa (Pty) Ltd, a division of Ash & Lacy Building Systems UK, Marsh oversees the operation’s manufacture and supply of innovative and cost-effective building envelope solutions that yield ongoing savings throughout the entire operational life of the building. He works closely with design professionals, property developers, contractors and building owners, offering expert consultation on energy-efficient roofing and cladding solutions that focus on sustainability and the reduction of carbon emissions. Highly skilled in conducting comprehensive roof and cladding refurbishment assessments – including alternative asbestos abatement methods – Marsh is also a noted authority on the groundbreaking Ashgrid spacer system, having played an instrumental role in launching and establishing the system. With his in-depth knowledge of the South African roofing and cladding sectors, Marsh remains committed to providing the industry with premium products, forward-thinking solutions and unmatched customer service.
SA Roofing thanks the SA Paint Manufacturing Association (SAPMA) for its editorial contribution to this issue that highlights some very important aspects of roof restoration, and painting specifically. In existence for more than 70 years, SAPMA’s manufacturing members represent 90% of the volume of paints and coatings produced in South Africa. The majority of companies supplying goods and services to the paint industry are associate members of SAPMA. The Association’s overall objective is to promote the industry as a responsible supplier of quality products and services. As such, it maintains a mandatory code of conduct that all members adhere to.
Upcoming Events WOODEX FOR AFRICA 9 – 11 JUNE 2016 | GALLAGHER CONVENTION CENTRE, MIDRAND, JHB Visit www.woodexforafrica.com for more info
TIMBER ROOF STRUCTURE WORKSHOP PRESENTED BY: WOLF PROFESSIONAL SERVICES 9 - 10 JUNE 2016: STELLENBOSCH, WESTERN CAPE 18 - 19 AUGUST 2016: CENTURION, GAUTENG 27 - 28 OCTOBER 2016: SALT ROCK, KZN Visit www.wolfpro.co.za for more info
CAPE CONSTRUCTION CONFERENCE & TRADE EXPO 11 – 12 AUGUST 2016 | CTICC, CAPE TOWN Visit www.cape-construction.co.za for more info
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INTERBUILD AFRICA 2016
(CO-LOCATED SHOWS: GLASS EXPO AFRICA, PLUMBDRAIN AFRICA, ECOAFRIBUILD AND HARDEX AFRICA) 17 – 20 AUGUST 2016, EXPO CENTRE NASREC, JHB Visit www.interbuild.co.za for more info
NEW! WOOD WORLD SOUTH AFRICA
(RUNNING ALONGSIDE INTERBUILD AFRICA 2016 IN HALL 5) Visit www.woodworldsa.co.za for more info
THE INSTITUTE FOR TIMBER CONSTRUCTION (ITC-SA) ANNUAL TIMBER ENGINEERED PRODUCT AWARDS 19 AUGUST 2016 (DURING INTERBUILD AFRICA 2016) EXPO CENTRE NASREC, JHB Email jenni@itc-sa.org for more info
JUNE 2016
I N S U L ATI O N
The hidden energy saver The significance of selecting the correct insulation product, coupled with ensuring that it is installed correctly, cannot be overemphasized. In this article, SA Roofing taps into the expertise of Duncan Goldsmith from leading insulation provider Rigifoam, to remind us why it doesn’t pay to skimp on insulation. Information and images provided by: Duncan Goldsmith, Co-founder and Managing Director of Rigifoam (Pty) Ltd.
Before installing LAMBDABOARD ® insulation. What are some of the distinguishing characteristics amongst insulation products and their different properties? Goldsmith: The two main mediums are open cell, being bulk or fibrous materials, and closed cell. Closed cell products insulate against all elements, including air and moisture, and these products do not compress, nor do they fill with dust and compress over the years. Bulk insulation needs to be installed in airtight, concealed voids such as attics. There is a condensation cycle that takes place within these products, affecting long-term insulation properties. It is important to follow the manufacturers’ instructions and guidelines on the correct application and installation in order to get optimum value from the products. Every insulation product works (although some undoubtedly better than others) on the condition that they are installed correctly. Different clients have different considerations when it comes to insulation for residential, retail, industrial and commercial application. How do the various insulation products address those needs?
JUNE 2016
After LAMBDABOARD ® installation. Goldsmith: All applications have different requirements, based on occupancy, HVAC and the method of installation. In the case of bulk insulation products, it is very important that they be installed where they are not compressed or exposed to wind and moisture. Remember, in residences a lot of moisture is created though occupancy – in bathrooms and kitchens especially. And some factory processes induce high humidity, such as food processing, print press, and any application using hydro technologies. Closed cell products are not affected in these applications. Radiant barriers are not thermal insulation and don’t insulate against convection and conductive heat transfer. For residential insulation, is there a different approach or best-method, and different recommended products, for conventional structures and ceilings as opposed to timber frame buildings and residences with timber ceilings or exposed beam ceilings? Goldsmith: Since most residential buildings are not airtight, open cell and bulk insulation products do not work. Just think of wearing a jersey indoors and then stepping out into the wind – the cold will cut straight through. The same principle applies here.
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I N S U L ATI O N
There are insulated ceiling boards available that are made out of closed cell materials, with LAMBDABOARD ® being the most thermally efficient product on the market. The ceiling boards act as a ceiling and insulation and also protect against water leaks and moisture. Timber frame houses would require cavity insulation (as do double brick walls in certain climates). Cavity wall insulation can be bulk insulation, provided it is airtight. Also, onecomponent foams can be used to seal off air leaks. Spray foam is ideal here, as its closed cell formulation adequately insulates against temperature differentials, air and moisture. It also adds structural strength. Most importantly, the key aspect to any insulation application is the minimization of heat bridging. As an example, think of a boat hull – you can have the strongest construction possible but if you have even one small hole, you will eventually sink. What are some of the most common installation mistakes or failures you encounter? How can they be remedied? Goldsmith: Contractors need ongoing training to ensure that they are installing the products correctly in order to achieve the quoted product performance. Employing cheap, high-turnover labour is not the answer and should not be practiced. But there are other underlying problems that the industry must combat. First, the supplier’s sales pitch can be a serious problem if it is only based on getting the order and not about the best investment for the building owner or tenant. Unfortunately, putting the client’s best interests first is a practice that is not always, nor consistently, carried out. The ‘cheap and nasty’ salesman’s pitch, to make a quick commission cheque, is the industry’s biggest hurdle. Every commercially available insulation product will do its job and insulate, provided that it is used as intended, and installed correctly. Industry players need to make a concerted effort to ensure that the right products are utilized for the right applications in the right way. Secondly, the perceived ‘high’ cost of proper insulation at installation stage should not be a deterrent, as the savings in energy usage will offset the initial expense within a few years. Insulation is the hidden energy saver and shouldn’t be compromised during the building process. A main problem when it comes to specifying insulation is that a strong focus is placed on the amount of savings achieved at the time of construction, and not necessarily on the long-term benefits. Judgement is passed on upfront savings, which could lead to cheaper product selection. But this is a short-sighted approach. It is not the designer or specifier that has to foot the utility bill every month, but the tenant. Often the tenant bears unnecessarily high utility costs because the insulation is not performing optimally – costs that could have been avoided or lessened had quality insulation been specified at the outset. Nothing is cheap if you want long-term value, and yet insulation is treated as a cheap component to the building process. One needs to look beyond the cost at specification stage and pay more attention to the best application for the client.
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What safety aspects are of importance in the field of insulation? Goldsmith: The risk of fire is always an issue, but people get misled in this regard. While some ‘non-combustible’ products burn worse than combustible materials in real-life fires, one needs to look at fire spread more than burning characteristics. This is because everything, even steel, burns if the temperature of the fire gets high enough. South African fire tests are antiquated and not to international standards. Insurance underwriters are now starting to dictate the test procedures since it is their risk. In terms of insulation, there are a myriad of other combustible items in a building that one needs to be more conscious of. You travel abroad for business regularly. How do you see South African products compare to overseas offerings? Goldsmith: South African products are of international standard. But again, they are not always specified correctly or installed correctly, and too often done ‘on the cheap.’ One aspect to note is that not all local products are environmentally friendly. Some contain HCFCs and formaldehyde-based binders. So, as an occupancy issue, they pose an environmental and health risk. What advances have you seen within the industry over the past few years? Goldsmith: Great strides have been made in educating the market on insulation, with load shedding having played a considerable role in this promotional drive. The future is bright for the insulation sector as more and more people are becoming conscious of their energy savings options, further spurred by Eskom tariff increases. But now the correct methods of installation need to be addressed. How do you feel about the current legislation that governs insulation, or energy efficiency in buildings? What additional measures do you feel need to be put in place to improve standards in our country? Goldsmith: It’s a great start, but some modifications are needed. For example, long-term insulation properties or compromising on efficiency during installing (compression) are not allowed for. It is perhaps wishful thinking, but the government needs to give tax incentives to those that comply. Furthermore, legislation should include environmental concerns because it is not a level playing field at present. Too many products offered are cheap but do not comply, whereas complying products cost more because they include more expensive technologies. Moreover, legislation needs to focus on installed values and not brochure values. Do you have a parting word of advice for our readers? Goldsmith: Don’t be penny wise and pound foolish when choosing your insulation medium. For more information, the author can be reached via email to duncan@rigifoam.com.
JUNE 2016
Insulation materials are rated for their ability to restrict heat transfer. This is also referred to as ‘thermal resistance,’ and is expressed as the R-value. Since Rigifoam introduced LAMBDABOARD to the local building industry in 2008, the product has become widely recognized for its high R-value performance: LAMBDABOARD has the highest R-value per 25mm thickness. LAMBDABOARD is a flexible faced PIR (polyisocyanurate) cored insulation board made on a continuous laminator. With reference to the SANS204 regulations within the building code, LAMBDABOARD is well suited to meet those demands as its high insulation properties compare so favourably to other commercially available insulation products. Due to its high R-value performance, the design U-value of the insulation system (thermal transmittance, or the transfer of heat through a material or a building element) can be achieved with a minimum thickness. This, in turn, enables the overall footprint of the building to decrease and thereby reduces the cost of construction.
RATIONAL DESIGN APPLICATION A dated 45,000m² shopping complex was in need of major renovations that included replacement of the entire roof as well as all the insulation. However, shortly after commencement of the project, the professional team encountered a problem with the specifications for the insulation upgrade. During the feasibility assessment, the quantity surveyor had allowed, and budgeted for, 135mm thick fibreglass wool-type insulation in accordance with the deemed-to-satisfy requirements under SANS10400-XA. Unfortunately the allowance had not taken into account the additional structure that was needed to support the roof sheeting over the 135mm insulation without compressing it, which would have negatively
impacted its performance. (The fibreglass would have been ‘squashed’ over the purlins and lowered the average thickness.)
I N S U L ATI O N
LAMBDABOARD® CASE STUDY
The team had to change course and consider board-type insulation. At first it appeared that compliant, deemed-tosatisfy 80mm LAMDABOARD was not an option due to strict budget constraints. However, by undertaking a Rational Design approach, the thickness of the required insulation was reduced – and along with it, the cost. In this case, it was determined that the deemed-to-satisfy approach would have resulted in a compromise on heat bridges over purlin where bulk insulation was compressed, in addition to presenting considerable fitting challenges. The engineering and energy management professional who was commissioned to do the rational design explained that, as insulation is added to obtain the required thickness of 135mm, at some point only marginal returns will be yielded. For example, if the first 60mm does 80% of the job, the next 20mm might take it up to 90%, with the next 20mm perhaps taking it up to 95%, but the rest contributing almost nothing. Calculations showed that, with LAMBDABOARD insulation, only 50mm across the entire mall was necessary to comply. This figure was later adjusted to 60mm in order to accommodate the reuse of three existing chillers, and was subsequently confirmed by the project’s mechanical engineer. The final required thickness of 60mm was the minimum roof insulation that allowed them to reuse the existing chillers and still achieve the HVAC load. The surplus money that resulted from the savings on insulation was channelled into a more efficient HVAC system that allowed for free cooling whenever possible. It was felt that, in that specific climate zone, the free cooling would actually yield higher energy savings than a thicker insulation board could achieve. For more information, visit www.rigifoam.com.
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JUNE 2016
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COV E R S TO RY
Best practice for onsite storage and metal roofing installation Metal roofing and cladding have become popular choices for every architect and contractor on the cutting edge of green, practical roofing and cladding. While the durability benefits, reduced energy costs and colour variety for aesthetics are obvious, it is key that every aspect of metal sheeting, including the material selection, profile (pierced or concealed), insulation requirements, fasteners, accessories and finally – installation, be carefully considered.
Proper on-site storing and handling of metal roof sheeting ensures aesthetic value and functional integrity.
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ssues around incorrect installation make up a large percentage of customer complaints for both residential and commercial/industrial sectors.
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Safintra advocates selecting an experienced and approved metal roofing installation partner who is familiar with the various metal roofing profiles, and whose installation experience can enhance the design, technical, structural and aesthetic vision, as well as adhere to the associated budgetary constraints of a building project.
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ON-SITE HANDLING AND STORING It is commonplace for concealed fix metal roofing to be rolled on site, and stored for later installation. Aluminium, ColourPlus®, ZincAL® and Rheinzink ® are all premium quality materials and should therefore be taken care of. All roofing materials must be kept dry during transit and storage, otherwise moisture can collect between sheets (particularly in the case of stacked sheets), causing significant damage and greatly reducing the material’s service life. If a bundle becomes wet, separate the sheeting and wipe it with a clean cloth to dry thoroughly.
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COV E R S TO RY
CORROSION BASICS In dealing with metal sheeting, an installer needs to remain mindful of the potential for corrosion at all times, as different metals have different physical and chemical characteristics – including the degree to which each of them corrodes. If two dissimilar metals are placed together, and water is present, an electrolytic circuit is created and one of the metals will start corroding while the other is relatively protected or untouched. However, if two roofing products are made of the same material, they are naturally compatible with one another. A mistake often encountered is where incompatible materials are used for roofing and guttering, causing accelerated drip corrosion (resulting from, for example, rainwater run-off into gutters).
INSPECTION BEFORE INSTALLATION Before commencing installation, the contractor should verify that the following items have been checked and are acceptable: • The fastener challenge Even the best planned and executed metal roofing package can be undone by one simple component: a substandard fastener. While some failures can be attributed to the wrong choice of fastener, the most common cause is products that do not meet the required standard. This is why it is imperative that roofing installers ensure the correct class and types of fasteners and accessories are always used in order to avoid premature corrosion of roofing components. Safintra recommends that installers ask for technical assistance from manufacturers to prevent dissimilar metals being coupled – and to reduce corrosion.
• Ponding and dust collection challenges Often, in unusually ribbed profiles, or in profiles not used with the correct pitch, extended moisture periods can occur and ribs can prevent sand and water from flowing away. Researching the technical specifications of products in order to ascertain whether the selected profile is correct for the specific application will extend the life of the roof. • Sunscreen – good for people, bad for roofing material In recent years it has been found that sunscreens containing semi-conducting metal oxides such as titanium oxide and zinc oxide will continue to damage the paint system on metal roofing materials in the presence of UV light and moisture. It is therefore recommended that installers wear clean, dry, cut-resistant gloves to prevent the roof from being in contact with titanium or zinc oxides.
ENSURE YOUR WARRANTIES Safintra recommends cleaning the surface of your roof regularly to ensure that material warranty conditions are met. There are reputable organizations within the southern African market that can assist with this and work with manufacturers to ensure that all is done in a matter befitting the warranty terms.
PIERCED OR CONCEALED PROFILES? The above guidelines are true irrespective of the profile selected; however, concealed fix profiles such as Saflok ® and Newlok™ lessen the burden of fastener selection as these profiles have exceptional wind uplift strength and allow for natural thermal movement.
FOR MORE INFORMATION Safintra has seven branches across South Africa, in Johannesburg, Durban, Cape Town, Nelspruit, Polokwane, Port Elizabeth and Bloemfontein. Further operations are in Namibia, Botswana, Mozambique, Malawi, Tanzania and East Africa.
It is of the utmost importance to use the correct and most compatible fasteners for every application. • Cleaning up during and after installation Swarf can refer to steel debris that comes about from cutting or piercing steel roofing, and may include shavings or filings or other material. This swarf tends to embed itself into either the paint coat or metal coat of the roofing, rendering it difficult to remove.
Safintra is a member of the Safal Group, one of the largest metal roofing companies on the African continent.
SAFINTRA (t) +27 11 323 6300 (e) marketing.safintraSA@safalgroup.com (w) www.safintra.co.za
If left on the surface of the metal roof, these particles will cause rust stains that will detract from the finished appearance of a project. These stains are often mistaken for early deterioration of the product.
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JUNE 2016
B U L K I N S U L ATI O N
Bulk insulation products feel the pinch Bulk insulation blankets provide a cost-effective and flexible solution when insulating roof assemblies where a minimum thermal performance is prescribed in accordance with the SANS10400-XA building code. However, compression of bulk insulation significantly reduces the performance of this form of insulation — and this is presenting the South African roofing sector with some very real installation challenges. Article and images provided by: Dion Marsh, General Manager of Ash & Lacy South Africa (Pty) Ltd.
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tudies have shown that compression of insulation reduces its performance by up to 50% depending on the installation methodology. It is precisely because of the detrimental effects of compression that SANS204 specifically stipulates that insulation must maintain its position and thickness throughout the roof assembly, except where it crosses roof battens or purlins.
THE CHALLENGE Per the prescriptive route of compliance, SANS10400-XA stipulates that a prescribed minimum total R-value be achieved based on the building classification and geographical location. These minimum requirements are unfortunately not being achieved in a large majority of new buildings being constructed in South Africa, due to compression caused by incorrect installation methods. And this has hugely negative ramifications on the overall energy efficiency and associated operational costs incurred over the life cycle of the building.
Compressed insulation can also result in reduced performance of the outer weather sheet, especially when the highly preferred concealed fix profiles are utilized. Installing concealed fix clips directly over bulk insulation results in compression ranging anywhere from 4mm to 20mm below the clip. This varied compression can result in misalignment of the clip, which affects the overall clipping action of the roof sheet. There is also considerable negative pressure imposed on the underside of the roof sheet when the uncompressed insulation on either side of the clip expands and attempts to bulk back to its design depth. This is particularly prevalent when thicker insulation is specified to meet the prescribed thermal performance. Unaddressed thermal bridging also plays a considerable role in reducing the overall thermal performance of a roof assembly. SANS204 stipulates that, when steel roof sheeting is affixed to steel purlins, a thermal break with a minimum R-value of 0,2m2 .K/W must be installed between the roof sheet and purlin. Bulk insulation compressed down to 4mm below roof sheeting or concealed fix clips does not achieve this requirement.
THE SOLUTION Physical mock-up with measured tapered compression.
Despite the challenges faced with over purlin installation, it is still the preferred method – and has been proven to be the most effective. Countries such as Australia and the UK had to face the very same challenges when energy efficiency standards were introduced to their markets many years ago. With the energy efficiency standards in South Africa being in relative infancy stage in comparison to our overseas counterparts, we are in an extremely favourable position to draw on the collective experiences of trusted international industry partners, such as CSR Bradford from Australia and Ash & Lacy Building Systems in the UK, to overcome these challenges.
Misaligned concealed fix clip caused by compressed insulation.
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JUNE 2016
FOAM SPACERS2
B U L K I N S U L ATI O N
There are a number of tried-and-tested systems designed to reduce or prevent compression of bulk insulation when installed over purlin, by raising the height of the outer weather sheet. However, it is imperative that the overall structural performance of the roof assembly and the attachment of the outer weather sheet be carefully considered when selecting a system. It is important to note that certain systems have very specific restrictions of use and are not designed as structural components of a roof assembly.
Foam spacers, such as the CSR Bradford ThermodeckTM spacer, are manufactured from high-density, extruded closed cell rigid foam.
MECHANICAL SPACERS1 Mechanical spacer systems, such as the Ash & Lacy AshgridTM system, are engineered to perform as structural components of the roof assembly and are used to eliminate compression of the insulation blanket whilst taking the guesswork out of roof assembly connections.
Ashgrid™ bracket and bar.
They comprise of lightweight structural steel purlins with engineered support brackets that are mechanically locked into position at specified centres. Mechanical spacer systems provide a structural interface between the primary purlin and the raised outer weather sheet. The support brackets are available in a variety of heights to accommodate corresponding blanket thicknesses.
The support brackets are secured directly to the purlins, creating a defined cavity for the insulation material and keeping fasteners within safe working lengths. The outer weather sheet is secured directly to the raised structural purlin, thereby ensuring clip alignment and fastener performance.
Thermodeck™ spacer. These spacers are secured directly to the purlins in continuous lengths after the insulation blanket has been draped over purlin. They still cause compression at the purlin, but allow the blanket to regain some loft between purlins by simultaneously elevating the weather sheet and providing the required thermal break. Draping the insulation over purlin results in a tapered compression, which does still affect the overall R-value of the installed insulation. It is extremely important to compensate for this loss in overall R-value by increasing the depth of the specified insulation blanket and packer accordingly. Accurate thermal modelling should be carried out to determine the additional depth of insulation required. IMPORTANT NOTE Foam spacers have a number of design constraints that limit their application: 2
• NOT suitable for any form of concealed fix roofing profiles • NOT suitable for roof pitches exceeding 5° • NOT suitable for high wind zones • NOT suitable for roof surfaces that support static or dynamic loads, including but not limited to loads such as: foot traffic, air-conditioning units, hot flues, vents, aerials, walkways, solar panels, etc. • NOT suitable as a wall spacer system
CONCLUSION The additional costs associated with the incorporation of a suitable spacer system into the roof assembly design remain negligible when considering the cost savings achieved by insulation that ultimately achieves its full design capability over the life cycle of the building.
Ashgrid™ with bulk insulation and straining wire. Specific loading requirements are achieved by varying the support bracket centres. Mechanical spacer systems form the backbone of single and dual skin built-up systems where specific structural, thermal and fire performance is required. Only accredited, independently tested mechanical spacer systems should be used. 1
JUNE 2016
Achieving energy-efficient, structurally sound and compliant roof assemblies no longer needs to be an onerous task for professionals and contractors. With proven installation methods and tighter on-site quality control, bulk insulation, whether used in single skin or dual skin applications, can still achieve its well earned reputation as an affordable solution in achieving excellent thermal, acoustic and fire performance. For more information, send an email to the author at Dion.Marsh@ashandlacy.com.
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SPAX Construction
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TI M B E R FA S TE N E R S
The right fastener for the right connection When it comes to timber structures, connections play an important role. They have an impact on the architectural design, load-bearing behaviour and stiffness, visibility and workflow during the pre-manufacturing as well as onsite assembly stages. SPAX, specialist fastener provider, tells us more. Information and images by: SPAX
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t is customary for structural engineers to design the structures and connections. Dowel-type fasteners such as screws, nails or bolts, as well as sheet metal fasteners are common connectors used for timber structures. These particular screws are suitable for many applications, for example: • For flooring that utilizes derived timber products: With an outer thread diameter ranging from 4.0mm to 4.5mm. • For cladding or decking in solid wood: With a diameter range of 4.5mm up to 5.5mm. (SPAX offers these fasteners in stainless steel for those scenarios where the structures are exposed to harsh weather conditions.) • In connections of structural members out of solid wood or glue-laminated wood: Depending on the size of the timber members, with a diameter range of 6.0mm to 10.0mm (up to 12.0mm) self-tapping, and up to 16mm in pre-drilled timber members.
For equal load-bearing capacity of the full-thread screws, the effective penetration length lef (point side) and lef,k(head side) in both members should be equal. For the first connection, beam to post, in case the beam is considerably high, the minimum penetration length in the post as a general rule should be at least lef = 14 x d1 (with d1 = outer thread diameter). For the second connection with bracing, in case the post is considerably small in width or the bracing is considerably high, and for bracings with an angle of 45° to post or beam, the minimum penetration length in the post or beam as a general rule should be in minimum lef = 10 x d1.
NOT ALL SCREWS ARE ALIKE It is possible to differentiate between screws based on their thread length, the partial thread, and full thread. With partial-threaded screws, timber members can be tightened together. Screws with a partial thread and washer head are perfectly suitable for tightening building parts together, or for tying down rafters. With full-threaded screws it is possible to reinforce timber members or high load-bearing connections in many variations. The following types of connections can be carried out easily and efficiently with SPAX self-tapping screws. Note: The rules applied for alignment and the load-bearing design are according to Eurocode 5 and the SPAX ETA 12/0114.
Connection 1: Beam to post. Connection 2: Bracing to post and bracing to beam.
• First connection: Beam to post with inclined screws. The washer head screw is the clamping tool to keep the two members in place during installation. The full-threaded screws secure the connection and ensure long-lasting load transfer. • Second connection: Bracing to post and bracing to beam with screws. Here again the washer head screw is the clamping tool to keep the bracing in place, offering free hands during installation. The full-threaded screws secure the connection and ensure high load-bearing capacity.
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AVAILABLE FROM:
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TI M B E R FA S TE N E R S
ALIGNMENT OF SCREWS FOR BEAM TO POST CONNECTION:
= midpoint of screw in timber d1 = outer thread diameter of respective screw
STRUCTURAL DESIGN FOR A GIVEN EXAMPLE OF BEAM TO POST CONNECTION:
h = height of beam in minimum 12 x d1 For SPAX 6mm: h ≥ 72mm For SPAX 8mm: h ≥ 96mm w = width of post in minimum 12 x d1 For SPAX 6mm: h ≥ 72mm (100mm preferred) For SPAX 8mm: h ≥ 96 mm (120mm preferred) a3,c = spacing parallel to grain for SPAX according to ETA 5xd1 For SPAX 6mm: a3,c ≥ 30mm For SPAX 8mm: a3,c ≥ 40mm For other screws: See Eurocode 5 a3,c = 10xd1, which is double to SPAX a4,c = spacing perpendicular to grain for SPAX according to ETA 3xd1 For SPAX 6mm: a3,c ≥ 18mm For SPAX 8mm: a3,c ≥ 24mm For other screws: See Eurocode 5 even up to a3,c = 4xd1 α = angle of screw to beam in a range of 60° to 75° lef,k = effective screw length head side lef = effective screw length point side
NOTE: For the screw design, the SPAX design guide (with explanations and load-bearing tables) is available in the SPAX download section on www.spax.com.
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11.0kN Design Value of fastener axial withdrawal resistance per screw, according to Eurocode 5 and SPAX ETA-12/0114, considering reduction factor k mod = 0.9 for wind loads and γM = 1.3 for material. For vertical uplift (e.g. wind), both full-thread screws equal to 19.3kN; for horizontal loading in beam direction both screws equal to 7.0kN.
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DESIGN OF SCREW LOADED ON PULL OUT
= midpoint of screw in timber d1 = outer thread diameter of respective screw h = height of bracing in minimum 12 x d1 For SPAX 6mm: h ≥ 72mm For SPAX 8mm: h ≥ 96mm w = width of post in minimum 12 x d1 For SPAX 6mm: h ≥ 72mm (100mm preferred) For SPAX 8mm: h ≥ 96 mm (120mm preferred) a3,c = spacing parallel to grain for SPAX according to ETA 5xd1 For SPAX 6mm: a3,c ≥ 30mm For SPAX 8mm: a3,c ≥ 40mm For other screws: See Eurocode 5 a3,c = 10xd1, which is double to SPAX
TI M B E R FA S TE N E R S
ALIGNMENT OF SCREWS FOR BRACING TO POST OR BRACING TO BEAM CONNECTION:
Fax,α,Rk nef fax,k d1 lef lef,k ρ k α
= characteristic value of fastener axial withdrawal resistance = effective number of fasteners = characteristic withdrawal parameter = outer thread diameter = effective thread length in member 2 (point side) = effective thread length in member 1 (head side) = characteristic density of wooden member = angle between the screw axis and the direction of the grain
a4,c = spacing perpendicular to grain for SPAX according to ETA 3xd1 For SPAX 6mm: a3,c ≥ 18mm For SPAX 8mm: a3,c ≥ 24mm For other screws: See Eurocode 5 a3,c = 4xd1 α = angle of screw to bracing 90° lef,k = effective screw length head side lef = effective screw length point side
Alternative: Traditional wood-wood connection secured with SPAX washer head screw.
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TI M B E R FA S TE N E R S
Pull out point side: Fax,α,Rk = 12N/mm² ∙ 8mm ∙ 195mm ∙ 0.85 ∙ 1 = 15.9kN Pull out head side: Fax,α,Rk = 12N/mm² ∙ 8mm ∙ 255mm ∙ 0.85 ∙ 1 = 20.8kN
min.
Reduction for governing load (wind) according to Eurocode 5 Reduction for material wood according to Eurocode 5
= 15.9kN
k mod = 0.9 γ M = 1.3
Design value of fastener axial withdrawal resistance: Fax,α,Rd = 15.9kN ∙ 0.9 / 1.3
= 11.0 kN governing
Design value of steel tensile resistance: ftens,d = 17.0 / 1.3kN
= 13.1kN
Group effect: 11.0 kN ∙ 20.9/2 = 10.3kN per screw; vertical component per screw = 9.65kN, horizontal component per screw = 3.5kN.
SPAX products are available in South African from FixTec. For more information, visit www.fixtec.co.za.
Tel: (021) 551 7533
www.fsroofwindows.co.za
Custom sized skylights, access hatches & glass pyramids
Tubular Skylights
Affordable
Reduces electricity use
Eco friendly
I N D U S TRY E V E NT
In pursuit of brilliance The ‘new-look’ 2016 sassda - Columbus Stainless Awards are gearing up to recognize a stellar list of award winners in October, with the news that sassda (the Southern Africa Stainless Steel Development Association) will provide a free consulting service to assist companies requiring help with the entry process.
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n the past, sassda found that, despite entry being free, some participating companies got held up in the actual application process. But now, sassda representatives can visit prospective entrants’ offices and assist them with the paperwork to ensure the process is as quick and easy as possible. “In this way, we also hope to increase the number of local and international entries from the 44 that we received in 2014, with the overall aim of ensuring the cream of South Africa’s stainless steel crop rises to the top in 2016,” says sassda Executive Director, John Tarboton.
BOOST TO INDUSTRY
John Tarboton - Executive Director of sassda.
Looking at the role the awards have to play in the growth and development of the local stainless steel sector, Tarboton says the importance of the awards shouldn’t be underestimated. “They’re instrumental in raising awareness of stainless steel and its myriad of uses and applications within the local and global economy. By recognizing excellence within the local stainless steel sector in particular, the awards have become a source of inspiration to ensure that global quality standards are adhered and strived for.”
In terms of entry requirements, individuals and companies (locally and abroad) that are involved in the design, production, conversion, distribution, use or specification of stainless steel are eligible to enter. The criteria for entries are as follows: • Excellence: Exceptional work concepts and execution • Innovation: Creativity, originality and advancement • Sustainability: For the business and environment • Efficiency: Keeping to deadlines and minimizing costs • Quality: Of the products and work done • Impact on the environment: Ensuring minimal carbon footprint • Job creation: Employment opportunities created
They now include: • Architecture • Building and Construction • Engineering • Export Achievement • Ferritic Stainless Steel • Duplex Stainless Steel • Food and Beverage • Catering and Hospitality • Art • Manufacturing Innovation • Product Development • Environmental Excellence; as well as • Student, Lifetime Achievement and Business Excellence awards.
A CLEAR RETURN ON INVESTMENT Overall, Tarboton says, the awards are an invaluable means of promoting entrants’ businesses. “Our aim is to boost the aspirational value of the awards by ensuring that participants see the clear return on investment that their participation and winning provides. This through the creation of greater market awareness of their product or service, as well as contact and networking with other key players in the industry. Ultimately, the awards should be seen as the ‘Oscars’ of the local industry. And with this streamlined entry process, we are putting our money where our mouth is when it comes to ensuring that everyone who deserves to be a winner, is a winner,” he concludes. Entries for the awards close on 31 July 2016 and will be judged by an independent panel of judges drawn from recognized professionals, representing all sectors of industry. Finalists and winners will be announced at a gala banquet on 20 October 2016. For more information, or to enter, visit http://sassda.co.za/stainless-steel-awards-entry-form-2016/ or send an email to francis@sassda.co.za.
This year’s revitalized awards are accommodating an enhanced list of categories, adjusted and expanded to improve their relevance to the real-world scenario that entrants face on a daily basis.
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PRO D U C T N E W S
Marley Building Systems delivers performancedriven commitment Marley Building Systems – a subsidiary of Belgian industrial group, Etex, is redefining building methodology with innovative, sustainable and complete building solutions.
Marley Building Systems also had a workshop area at the expo where visitors could attend scheduled product demonstrations on the four brands currently in the company stable.
Marley Building Systems’ stand at the African Construction and Totally Concrete Expo held at Gallagher Convention Centre on 10 and 11 May 2016.
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tex specializes in the manufacturing and marketing of building materials across four business units: cladding and building boards in fibre cement and plaster, roofing materials, passive fire protection, and high-performance insulation and ceramic wall and floor tiles. Subsequent to the acquisition of the Lafarge Gypsum business in November last year, Marley Building Systems can now deliver to the market a complementary collection of brands from one supplier. These brands include Marley Roofing for roofing, Kalsi for fibre cement, Siniat for plasterboard and Equitone for decorative façades. This move has been welcomed by architects and building contractors, among other industry players, making Marley Building Systems a one-stop-shop for superior roofing, cladding and dry construction solutions. At the recent African Construction and Totally Concrete Expo at the Gallagher Convention Centre, Mark Irving, Managing Director of Marley Building Systems in South Africa, said the company is working hard to entrench its presence in South Africa and cross-border into the rest of Africa. “We want our products to tell a story,” he said. “A story that reflects the creative, technically sound and performance-driven commitment of Marley Building Systems to sustainable building solutions in Africa.”
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NEW RANGE OF CLAY ROOFING TILES The product portfolio of Marley Roofing includes all types of concrete and clay tiles as well as the more modern fibre cement slates. Working with some of South Africa’s leading roofers in providing a vast range of roofing products, Marley Building Systems is confident that Marley Roofing will continue as a stronghold in the marketplace through its delivery of precisionengineered products that meet environmental standards (SABS ISO14001) and surpass quality and performance standards for applications ranging from educational, hospitality and healthcare, to commercial and residential. The new range of international clay roofing tiles now available through Marley Building Systems is a prime example of the competitive edge that has been added to Marley Roofing’s offering. “The range is different and revolutionary, and our most demanding customers have already taken a liking to it,” says Isaac Simelane, Architectural and Specification Manager at Marley Building Systems. “The high quality of the tiles is obtained with an advanced technological process that is soluble salts resistant (perfect for coastal areas), ice resistant, watertight and impermeable, with a low porosity of less than 3%.” For more information, email Ayanda Ndlovu, Communications and Product Manager, at ayanda.ndlovu@marley.co.za or call (011) 316 2121.
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Innovative. Sustainable. Complete.
Innovation is at the heart of our priorities. Our extensive product range blends sustainability and architectural creativity to inspire better ways of building and living.
Our Fibre Cement Facades, Fibre Cement & Gypsum building boards and Roofing solutions put us in a unique position to contribute to complete solutions for building projects
Tel: 011 316 2121
Fax: 011 316 4138 Web: www.marleybuildingsystems.co.za
ISOVER’s Factorylite Insulation Factorylite is a leading Glasswool roof Insulation faced on one side with either a reinforced foil or white metalized foil. It is specially developed for metal buildings and has two main attributes that are critical when choosing insulation. Firstly stabilizing the indoor comfort levels providing efficient thermal and acoustic properties and secondly the prevention of moisture collecting due to condensation which can lead to physical degradation. Factorylite Features and Benefits Energy Efficiency - Meets the requirements of SANS 10400 XA by reducing heat loss/gain due to the inherent thermal insulation properties and is suitable for high humidity applications and eliminates condensation. Acoustic Properties - Offers exceptional acoustic properties & enhances indoor environmental quality by absorption of noise. Fire Properties - Factorylite is a non combustible material tested to SANS 10177 Part 5 and achieves a Class 1 fire index rating when tested to SANS 10177 Part 3. It also meets the international norms and standards tested to EN 13823, EN 13501-1 and ASTM E-84 Environmental Sustainability - Glasswool is made from a combination of naturally occurring silica, fluxing agents and up to 80% recycled glass. Glasswool has a Zero Ozone Depleting Potential (ODP) and no CFC’s or HCFC’s are produced in the production process.
Lamination The lamination process of applying adhesives and a facing to the Glasswool insulation blanket is a critical part of the product’s designed performance. It can greatly affect the thickness recovery of the insulation and the fire properties of the material due to the performance of the facing and amount/ type of adhesive applied. ISOVER’s lamination process is monitored under stringent conditions in accordance to ISO 9001. Condensation Condensation should be controlled in metal buildings, as condensed water droplets on the metal can corrode the integrity of the structure. Using aluminum foil on its own as a vapor-retarder does not control condensation. Factorylite insulation is of utmost importance as its thermal performance ensures that dew point is not reached. Accreditation
Membership
Tel: 0860 ISOVER (476837) Fax: 086 673 1088 www.isover.co.za Download the isover SA app
• Metal Buildings • Shopping Centres • Commercial Buildings • Warehouses • Schools • Hospitals
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R E S I S TA N C E
TH
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Factorylite insulation meets the requirements VA L
UE
Tel: 0860 ISOVER (476837) Fax: 086 673 1088 www.isover.co.za Download the isover SA app
E PD M
The ABCs of EPDM Sustainability and environmental conservation are two of the top priorities in today’s construction industry. And using building materials with a long life expectancy is one of the best ways to achieve longterm sustainability, says Robert Brooker from Waterbrothers. In this article, he tells us why EPDM should be at the top of the product list. Article and images by: Robert Brooker, Owner of Waterbrothers cc
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PDM is a 100% cured, single-ply roofing membrane made of a synthetic rubber, Ethylene-Propylene-Diene Terpolymer. EPDM is unmatched when it comes to longterm service life. For more than 50 years, EPDM has proven to be reliable and sustainable. Moreover, EPDM can be recycled at the end of its service life. When it comes to selecting building materials while playing your part in helping to conserve natural resources, it is both practical and viable to choose products with long life expectancies that will minimize or delay the need for replacement. In this regard, one cannot beat the exceptional service life that EPDM yields: • 30-Year aged EPDM exhibits properties that actually exceed those of new EPDM • One of only a few membranes with 50+ years of real-world experience • Industry-leading UV weathering resistance compared to other membranes • Excellent resistance to hail damage (documented in numerous tests) • Added protection against premature failure caused by condensation • Extremely repairable membrane, even at the end of its service life
6. Safer adhesive technology: EPDM uses a chemical bond and does not require any flames or heat to install. 7. EPDM is completely maintenance-free and comes with a guarantee of up to 30 years. 8. Fewer seams: EPDM comes in 9m-wide sheets, which eliminates the need for multiple seams. 9. Durability: Asphalt tends to become brittle with age, leaving it vulnerable. EPDM retains its elasticity. 10. Puncture resistant: EPDM has been proven to outperform asphalt in numerous tests over the years.
INSTALLATION METHODS To waterproof roofs, three main installation methods are used for EPDM.
1.FULLY ADHERED SYSTEM The fully adhered roof system offers a high degree of stability and uplift protection where high wind is a concern. The EPDM is adhered directly to the substrate using a bonding adhesive that is specifically formulated to bond the single-ply membrane to just about any surface.
LIFE CYCLE ANALYSIS In a study assessing the cradle-to-grave impact of raw materials, manufacturing, installation and disposal, additional environmental benefits of EPDM were identified. Some of the reasons why EPDM outperforms other waterproofing products include: 1. Long service life: EPDM has been tested and used for more than 45 years. 2. Natural resource conservation: EPDM weighs half of what bitumen weighs and consumes fewer natural resources. 3. Reduced oil consumption: Asphalt is a by-product of oil. EPDM can be produced from natural gas. 4. Ponding water: EPDM is not affected by ponding water and has been used as pond liners for decades. 5. Flashing details: Many bitumen products exclude details from their warranties, but with EPDM the flashing details are covered.
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2.BALLASTED SYSTEM Because of its fast installation and insulation properties, ballasted systems are an extremely economical choice. The EPDM membrane is loosely laid on the substrate together with a geotextile for added protection, and then a ballast consisting of stone or pavers is used to hold the membrane in place. The ballast helps to shield the membrane from the elements, thereby extending its service life.
3.INVERTED BALLASTED SYSTEM This is the preferred roofing system especially designed for high-traffic roofs. It is comprised of a layer of loosely laid single-ply EPDM with an insulation board covered by a geotextile, and then a ballast is added to hold the whole system down. Quick to install, this system can also be retrofitted to existing buildings where the roof can accommodate the load. The inverted ballasted system makes the building extremely energy efficient in both hot and cold climates.
For more information, visit www.waterbrothers.co.za or email the author at info@waterbrothers.co.za.
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ENQUIRIES: info@trussworks.co.za TEL: 082 776 1097
ALL TYPES OF SLATE FOR ALL TYPES OF ROOFS
NATURALLY SLATE is a roofing company based on pure quality natural products. We are the sole importers of Spanish conventional slate. We also specialize in Mazista, sheeting, Zinc Titanium profiles/flashings and bespoke truss designs. • Spanish Slate • Mazista Slate • Roof Repairs • Roof Inspections • Zinc Titanium Profiles • Sheet Roofing • Bespoke Truss Design
Tel: (021) 704 1122 Fax: (021) 704 1110 Email: erik@naturallyslate.co.za / info@tsrw.co.za Address: 12 Ferndale drive, Ottery, 7800 (Cape Town)
ALL UNDER ONE ROOF
TSRW can install into any roof profile and any pitch. Roof windows are very well-suited to thatch roofs, especially when large eaves shadow the windows below. Roof windows also add to the beauty of exposed beam ceilings. Since 1988, TSRW has been trusted to install top-quality roof windows. They complement every roof. We are the leading manufacturer of the centre pivot roof window in Africa. Call us today for your custom-fit window
• Specialist manufacturer of roof windows and skylights • Well over 40,000 windows fitted nationwide • Adheres to SANS10400-A and SANS10400-XA • Natural light – with a view • Improved ventilation and heat control
www.tsrw.co.za
S A F E T Y EQ U I P M E NT
The shocking truth about shock absorbing lanyards Many view the widespread use of shock absorbing lanyards as a turning point in height safety (safety for the masses) and hail it as a lifesaver. But others reel at the mere sight of it. Hein Stapelberg of Fall Protection Works explores this point of contention and helps us understand why an apparent leap in the right direction on the worksite is frowned upon by some. Article and images by: Hein Stapelberg, Co-owner of Fall Protection Works
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caffolders, painters, roofers and maintenance and construction crews all use it. To the industry at large, the shock absorbing lanyard has become so synonymous with safety at height that, nowadays, most manufacturers sell it as a unit stitched to and integrated with the full body harness rather than an add-on item. Shock absorbing lanyards (also known as fall arrestors, energy absorbers and a range of other terms) are the go-to safety gear for work at height professionals. It is safe to assume that the shock absorbing lanyard is the single most used item among fall protection equipment in South Africa – and possibly the world. So why any hesitation, and why isn’t it unequivocally accepted and used by all? Here are a few things to consider before buying a set of shock absorbing lanyards:
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IT ALLOWS FOR A FALL Take a moment to consider that. When working at height, the one thing central to a person’s safety is whether they can actually fall (off, from, or into) or not. The ‘standard operating procedure’ for a shock absorbing lanyard includes it allowing you to actually fall. That’s comparable to having a proven cure for malaria, but in order for it to work, you first need to contract malaria. Whatever happened to prevention being better than cure? It could be said that the shock absorbing lanyard’s modus operandi has a primary assumption that reads: ‘The user is falling, uncontrollably and with no other measures in place, from an unknown height.’ The shock absorbing lanyard requires the user to fall before it starts to address the situation.
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S A F E T Y EQ U I P M E NT ITS ABILITY TO DO ITS WORK (ARRESTING A FALL) DEPENDS ON THE ENVIRONMENT IT IS USED IN Shock absorbing lanyards are designed and manufactured in such a way that the equipment starts getting activated by a force exceeding 2kN – roughly comparable to a load of 200kg. Work situations that pose a risk of falling vary widely, and therefore the resulting force of a person’s fall can also vary, depending on several factors. Examples include how much slack is in the lanyard at the time, the projection of the fall (e.g. straight down or in a pendulum motion), the person’s body posture and orientation at the time, etc. These types of factors influence the force that is finally exerted on the shock absorbing lanyard and, in turn, the relative effectiveness with which it can perform its duties. In addition, moisture levels, ambient heat, age and the exposure of the materials to chemicals (even airborne) can all affect the ‘tearability’ or force-absorbing performance of the shock absorbing lanyard. And that means little predictability and varying performance.
IT’S EASY TO USE IT INCORRECTLY Shock absorbing lanyards are advanced pieces of equipment resulting from many years of research and development. The typical shock absorbing lanyard is made up of various elements: connectors, connection rings, webbing, buckles, protective sheaths, etc.
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However, some of these elements have been shown to be incompatible with other components within the fall protection system during what could be considered ‘normal’ use. For example, as a result of the violent shaking and twisting of the equipment during the arrest of a fall, some connectors may inadvertently become disconnected from the anchor point during the fall event. Moreover, it can easily happen that a lanyard gets used incorrectly in a way that exceeds the ability of the equipment to arrest a fall safely. Examples include overloading or crossloading it. On South African worksites, it is unfortunately not uncommon to find users inadvertently short-circuiting the shock absorbing element of the lanyard through incorrect tie-back practices.
YOU NEED SPACE – LOTS OF IT Most shock absorbing lanyards found on construction sites are inexpensive, simple designs that are not adjustable in any way. That means the user will fall the entire length of the lanyard before it is activated. And once it is activated, it stretches even more. The result of this is that the area below the user might have to be significantly clear and open – essentially free from any obstacles that might interfere with the fall trajectory or the pendulum of the user after a fall. But in reality, very few worksites offer that option.
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FALL ARRESTED. NOW WHAT? In a real sense, the shock absorbing lanyard effectively led to the establishment of an entire rescue industry. Being suspended in a full body harness is extremely uncomfortable – and dangerous. And all the more so when suspended at the end of a 2m-long lanyard, which is commonly attached to the user’s back attachment point. It's a high-risk position to be in, and it demands an immediate response in order to limit the damage that is already occurring within the casualty’s body. With most shock absorbing lanyards, there’s little on offer at this point for the user. Some have built-in relief straps (a strap that you can stand on, but which is attached to a point on your harness), but such measures are temporary. There are many more considerations to be aware of when choosing your fall protection equipment. With proper training and good fall protection planning, and by using products from reputable manufacturers, it is possible to use shock absorbing lanyards safely. But the current trend of ‘grab and go’ is not conducive to favourable statistics. Shock absorbing lanyards are often not the best (or even a good) solution for working in a fall risk position. Consult a qualified industry professional to assist you with the best-suited safety equipment and a custom safety programme for your specific operational needs. For more information, send an email to the author at hein@fallprotectionworks.com or call 0860 No-FALL.
S A F E T Y EQ U I P M E NT
Sites are usually a maze, made up of scaffolding, formwork, tools, equipment and structures. In such cases, a person’s fall may still be arrested, but the ‘safely’ part effectively falls away. Many fall injuries actually result from the casualty striking an obstacle during the fall or during the resulting swing.
City Ceilings offers a complete range of products for drywall partitioning, suspended and skimmed ceiling material and all other accessories. Stockist of:
Strand
Lansdowne
Unit 1 Maynhardt Street, Strand
Unit 8 Lansdowne Junction, Induland Crescent, Lansdowne
Tel: 021 854 8550/2 Email: sales@cityceilings.co.za
Tel: 021 691 0084 Email: sales@cityceilings.co.za
www.cityceilings.co.za
ROO F TO P M A N AG E M E NT
Rooftop management for healthcare facilities In this article, Mark Swemmer from Jasco Property Technology Management shares his view on the importance of effective rooftop management, and how a comprehensive rooftop service can benefit the private healthcare industry. Article by: Mark Swemmer, Business Manager - Jasco Property Technology Management
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he primary function of private hospitals is to provide healthcare services. However, they are effectively a business just like any other large enterprise. They are faced, like any other property owner, with the challenge of having to manage multiple facilities at their premises. One fact that is most frequently overlooked is effective management of the rooftop space of hospital and clinic buildings. Outsourced rooftop management can assist healthcare groups and facilities to simplify the management function and associated challenges, including health and safety requirements, space management, asset management, and the effective meter management of the energy consumption of equipment that resides on the roofs of these facilities. The lack of rooftop management can even result in a loss of revenue. These rooftops house a wide variety of telecommunications infrastructure in order to provide communication for hospital patients, staff, IT equipment, visitors as well as surrounding areas. Without an asset register, it is almost impossible to track the abundance of equipment from a variety of tenants. Without control, equipment can be installed on the rooftop without the knowledge of the healthcare facility. This leads to the challenge of general access to this equipment, as management are not aware of what equipment resides on the rooftop – but more importantly, who is allowed access to this equipment. Without rooftop management, lease management is difficult, since a lack of this information hinders the ability to review leases when they expire, and pricing cannot be maintained in line with current market values. Rooftops tend to become labyrinths of masts, antennas, satellite dishes, security cameras, transceivers and more. This haphazard and unmanaged approach may be in breach of health and safety regulations. And more often than not, facilities managers are unaware of this fact. Exposed cabling and points of connection that are not properly enclosed may be a fire hazard, and ignorance does not remove the liability to the property owner should something go wrong. An outsourced rooftop management service can assist to identify these areas of risk and provide recommendations to resolve them. Most buildings’ rooftop space is limited, so it is imperative for this area to be effectively managed as there is an overall increase in demand for wireless technologies to be deployed. If this is achieved, space for water tanks, solar panels and generators can be taken into consideration.
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Mark Swemmer, Business Manager - Jasco Property Technology Management There are many benefits to effective rooftop management; however, this is often overlooked as it requires specialist skills and knowledge of telecommunications infrastructure and equipment. This is not the core business of either hospitals or the majority of facilities managers. Without this expertise to understand exactly what infrastructure is installed and for what purpose, it becomes almost impossible to adequately manage the rooftop’s real estate. Outsourcing this service to an expert service provider can help healthcare facilities and private hospital groups to address this challenge head-on. A comprehensive service, including a full audit, professional advice and active management of rooftop equipment, provides a complete managed solution and service through a single point of contact. A complete managed rooftop service can assist private healthcare groups to leverage professional management and the standardization of rooftop installations across their entire property portfolio.
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I N S U L ATI O N
Insulation and the Energy Efficiency Regulations TIPSASA, the Thermal Insulation Products & Systems Association SA, has released its highly anticipated ‘TiPS Guidebook on Thermal Insulation & Energy Saving.’ SA Roofing appreciates the opportunity to share with our readers valuable information contained in the TiPS Guidebook, not only in this issue, but future editions as well. To start, we refresh ourselves with some current regulatory mandates. ENERGY EFFICIENCY REGULATIONS GOVERNMENT: REGULATION XA National Building Regulations and Building Standards Act 103 of 1977 – Amended 9 September 2011 to add Part X: Environmental sustainability & PART XA Energy usage in buildings
REGULATION XA1:
REGULATION XA2:
REGULATION XA3:
Design & construct buildings energy efficient
At least 50% of annual hot water other than electrical heating (solar, heat pumps, etc.)
To comply with XA1 a) SANS10400-XA; or b) Rational design; or c) Theoretical calculation
RATIONAL DESIGN
DEEMED-TO-SATISFY
AGRÉMENT SOUTH AFRICA
APPOINT
PURCHASE
OBTAIN
Competent Person: Engineer to do the design
or
SANS10400-XA Energy usage in Buildings
NOTE: SANS10400-XA & SANS204 have the same insulation requirements
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or
Agrément Certification “Fit for purpose”
Building Envelope Requirements: Orientation & shading; Walls; Fenestration; and Roof Assemblies
SANS204 ENERGY EFFICIENCY IN BUILDINGS JUNE 2016
In order to contribute to the reduction of greenhouse gases, buildings and extensions to buildings in respect of which plans and specifications are to be drawn and submitted in terms of the Act, having A1, A2, A3, A4, C1, C2, E1, E2, E3, E4, F1, F2, F3, G1, H1, H2, H3, H4 and H5 occupancies or building classifications in accordance with Regulation A20, excluding garage and storages areas contained within such occupancies, shall be designed and constructed so that they:
achieved by compliance SANS10400-XA; or
PLANS AND PARTICULARS TO BE FURNISHED
A2 (1) Any person intending to erect any building, shall submit to the local authority the following plans and particulars, together with the application:
REGULATION XA2
a) has an orientation of the longest axis, shading, services and building envelope in accordance with SANS10400-XA; or b) is the subject of a rational design by a competent person, which demonstrates that the energy usage of such building is equivalent to or better than that which would have been
(g) a declaration by a person registered in a professional category of registration in terms of one of the councils for the professions identified in the Council for the Built Environment Act, 2000 (Act No. 43 of 2000) in the relevant portion of Form 1 contained in SANS10400-A as to how the applicable functional regulations shall be satisfied.
REGULATION A19
APPOINTMENT OF PERSONS RESPONSIBLE FOR DESIGN, INSPECTION AND ASSESSMENT DUTIES A19 (13) Where any person provides any information or certificate required in terms of this Regulation of which he or she knows to be incomplete or false, such person shall be guilty of an offence.
SANS10400 PART A BUILDING OCCUPANCY APPLICABLE TO REGULATION XA1 A1
Entertainment & Public Assembly
E3
Other institutional (residential)
A2
Theatrical & indoor sport
E4
Health care
A3
Place of instruction
F1
Large shop
A4
Worship
F2
Small shop
A5
Outdoor sport
F3
Wholesalers’ store
B1
High risk commercial service
G1
Offices
B2
Moderate risk commercial service
H1
Hotel
B3
Low risk commercial service
H2
Dormitory
C1
Exhibition hall
H3
Domestic residence
C2
Museum
H4
Dwelling house
D1
High risk industrial
H5
Hospitality
D2
Moderate risk industrial
J1
High risk storage
D3
Low risk industrial
J2
Moderate risk storage
D4
Plant room
J3
Low risk storage
E1
Place of detention
J4
Parking garage
E2
Hospital
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of
REGULATION A2
Equipment and plant required for conducting the business of the occupant shall be excluded from these requirements.
The requirements of sub-regulation XA1 shall be deemed to be satisfied when such building is designed and constructed in accordance with the following requirements:
requirements
SANS10400-A: 2010 EDITION 3
b) have a building envelope and services which facilitate the efficient use of energy appropriate to its function and use, internal environment and geographical location.
REGULATION XA3
the
c) has a theoretical energy usage performance determined using certified thermal calculation software, less than or equal to that of a reference building in accordance with SANS10400-XA.
a) are capable of using energy efficiently while fulfilling user needs in relation to vertical transport, if any, thermal comfort, lighting and hot water; or
At least 50% by volume of the annual average hot water heating requirement shall be provided by means other than electrical resistance heating, including but not limited to solar heating, heat pumps, heat recovery from other systems or processes and renewable combustible fuel.
with
I N S U L ATI O N
REGULATION XA1
SOURCE CREDIT ‘TiPS Guidebook on Thermal Insulation & Energy Saving’ © TIPSASA 2016 For more information, visit the TIPSASA website at www.tipsasa.co.za.
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M A I NTE N A N C E , PA I NT S & COATI N G S
Roofing Matters:
What you should know about roof restoration (Part 2) In the previous instalment of our Roofing Matters series, Toni Stella pointed out important aspects of roof restoration – and painting specifically. Here he continues to share pertinent facts and very practical solutions to very common problems, while giving further pointers that will ensure the paint work ends in a job well done. Article by: Toni Stella, National Training Manager of the SA Paint Manufacturing Association (SAPMA)
Adding new colour not only makes a roof look more attractive but also boosts property values.
A
s full restoration can be reasonably expensive, it is recommended to homeowners that they carry out a certain amount of general maintenance on their homes’ roofs. Moreover, poorly maintained roofs can cause severe damage to interior and exterior walls.
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Any unwashed areas of the roof that are not exposed to natural rainfall, including fascia and spouting systems, should be hosed down at least once every six months. Furthermore, it is important to promptly remove any organic growth like lichen or moss build-up, as it can damage the surface of the roofing material. For removal of organic growth, a recognized moss treatment process should be undertaken.
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PROBLEM
SOLUTION
Dirty surface
• Clean the surface thoroughly, using an alkaline degreaser. Mix 1 part of the alkaline degreaser with 5 parts of water. Apply with a cloth or sponge, and allow soaking into the dirt. Scrub the surface and rinse off thoroughly with clean water. • Allow the surface to dry properly before painting.
Roof leaks
• Fix all leaks before painting. Leaks might be due to broken tiles, ineffective flashings, overlaps between roof sheeting, weathered areas around roof nails, etc. • Treat the surface with a waterproofing compound.
Algae and fungus
• Remove by scraping, wire brushing or scrubbing with a hard bristle brush and fresh water. • Apply a fungal wash, diluted with 1 part of water to 1 part fungal wash. Be sure to protect your hands and eyes. • Leave to dry, then scrub thoroughly with plenty of fresh water and a hard bristle brush to remove all traces of fungal wash and dead growth.
New, unpainted roofing in overall sound condition
• Wash/scrub down thoroughly with an alkaline degreaser. • Rinse well with fresh water and allow the surface to dry.
Cement/Fibre cement roofing
• Scrub the surface using an alkaline degreaser solution and bristle broom (course scrubbing brush) to remove debris and loose material. • Use a breathing filter to avoid inhaling any dust. • Scrape the surface to create a sound base. • Rinse thoroughly with tap water while scrubbing the surface with the bristle broom. • Allow to dry completely before painting. • Seal the entire roof with masonry primer.
Bare areas of cement or fibre-reinforced surfaces
• Prime with an acrylic roof paint, undiluted. • For aged and friable surfaces, prime with a bonding liquid.
New galvanized iron roofing material
• Degrease by brushing a galvanized iron cleaner onto the entire surface. • Rinse with tap water. • Repeat cleaning until a ‘water break free’ surface is achieved. To check this, pour half a cup of water on the surface and wipe your hand through it. The water must run freely. If it collects in droplets, it is not water break free. • If the surface is less than 1km from the sea, apply a coat of anti-corrosive primer. • Apply two coats of acrylic roof paint.
Aged/Rusted galvanized iron roofing material
• Scrub rusted areas with emery paper or a wire brush until the surface is bright. • Apply galvanized iron cleaner to the entire surface and leave to react for 2 minutes. • Hose and scrub down with tap water, using a hard bristle brush or broom to obtain a water break free surface (see explanation above). • Patch prime-prepared bright metal areas, where galvanizing has been depleted by rust, using an anti-corrosive primer. • If the surface is less than 1km from the sea, prime the entire roof with anti-corrosive primer. • Apply two coats of acrylic roof paint.
Previously painted with enamel (still in good condition)
• Sand the existing paint to a matt surface. Wash thoroughly with an alkaline degreaser and Scotch-Brite™ pads. • Rinse with clean running water.
Peeling, flaking or cracking paint
• Strip back to the metal using a paint stripper that penetrates the paint, causing it to blister. • Use a paint scraper to remove the blistered paint. Use steel wool or emery paper if necessary. • Wash thoroughly and sand the metal surface. • Prime the surface immediately.
New mild steel, coated with factoryapplied red primer
• Sand the steel before applying a metal primer.
Corrosion of mild steel
• Corrosion occurs as red rust. Remove the rust by means of mechanical driving, abrasion, sand blasting or coarse sand. • Alternatively, use a rust converter. This is a one-step rust converter, primer and sealer for the treatment of rust. The creamy white water-based product converts rust into a dark blue material to show that conversion has occurred. Remember that a rust converter may only be used on mild steel. The rust converter must be protected with a full paint system. • Before applying a rust converter, remove all greases, oils, tars etc. with an alkali degreaser, and remove thick rust or blisters by wire brushing so that only thin surface rust remains. • Apply a rust converter by brush or spray. Wait for 3 hours and rinse thoroughly with water before commencing with painting.
Galvanized iron (new and bright)
• Degrease with galvanized iron cleaner. • Remove white rust with emery paper, but be sure not to ruin the layer of galvanizing. • The surface is clean when water that is poured over it runs smoothly off the surface in a water break free line. • Prime with a galvanized metal primer.
Galvanized iron gutters
• Degrease the gutters (as described above), rinse thoroughly and allow to dry. • Paint the inside of the gutter with bitumen.
Weathered and unpainted galvanized iron
• Clean with alkaline degreaser. • Scrub with a wire brush, rinse thoroughly and allow to dry. • Prime with a metal primer within 24 hours.
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M A I NTE N A N C E , PA I NT S & COATI N G S
COMMON ROOFING PROBLEMS AND EFFECTIVE SOLUTIONS
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PA I NT S & COATI N G S
FACTS ABOUT TILED ROOF LEAKS Leaks are usually confined to small areas and caused by one or more of the following problems:
PROBLEM Cracked or broken cement mortar bedding to the ridge and hip capping:
The capping should be re-bedded or re-pointed.
Cracked or broken roof tiles (sometimes just one tile):
The individual roof tiles should be replaced.
Roof tiles displaced:
The displaced tiles should be put back into their proper position.
Blocked drainage channels under the ‘side laps’ of individual tiles:
Any build-up of dirt or debris should be removed.
Flashings blocked, damaged or displaced:
These problems should be corrected.
Blocked gutters, including valley gutters and downpipes:
These should be cleaned out.
COMMON MYTHS AND CLAIMS ABOUT TILED ROOFS MYTH: Tiled roofs need painting or coating. FACT: This is generally not true, unless you are concerned about the appearance of the roof, or want to change its colour. MYTH: Prolonged weathering of the original surface makes concrete tiles porous. FACT: This is not true for concrete tiles; however, some concrete and clay tiles manufactured more than 20 years ago have been known to absorb water or to fret or crumble under adverse conditions. But coating will not fix this problem. Such tiles generally need to be replaced or repainted every three years. MYTH: Concrete tiles absorb so much water that the roof can collapse and stumped houses can get pushed into the ground. FACT: This is not true. MYTH: Lichen eats into concrete tiles. FACT: This is not correct. Lichen can sometimes block small drainage channels at the side laps of some tiles, but this is a minor maintenance issue.
CALCULATING PAINT QUANTITIES The following factors need to be taken into account: • Absorption The more porous the surface, the more paint will be required. So, porous cement tiles, being absorbent, will use more paint than galvanized iron roofs. • Previously painted surfaces Roofs that have been painted previously usually require less paint when being repainted. This is because the original layer of paint has already sealed the surface, thus reducing its porosity. Naturally, this effect is less significant if the original paint or the surface is in bad condition. • Roof profiles Corrugated or profiled galvanized iron and fibre-reinforced roofs will have a greater surface area than certain tiled roofs because of their surface profile. 1. As a rule of thumb, measure the length and breadth of the floor area of a building, including the roof overhangs. 2. Add 50% to the area obtained, to compensate for the profile and pitch of the roof. 3. Then divide the area by 6m²/ℓ, and 4. Multiply by two, for two coats.
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REPAIR REQUIRED
EXAMPLE: 1. 10m x 12m = 120m² 2. + 50% (120m² + 60m²) = 180m² 3. 180m² ÷ 6m²/ℓ = 30ℓ 4. x 2 (30ℓ x 2) = 60ℓ for two coats
SOME SOUND ROOF PAINT TIPS • When painting a roof, make sure you are able to get back down from the roof without having to walk over wet paint. This can be avoided with a little planning before you start. • If you use an airless spray gun to paint the roof, take care and try as far as possible to avoid painting on a windy day. There is always some over-spray, and it can be carried a long way in windy conditions. • Check the weather forecast before you start. You do not want to paint your roof if it is going to rain. If it is going to be very hot, it is advisable to start early. • There are a few choices when it comes to roof paint quality. You will have to decide what is best for you, also considering how much you are willing to spend. • Water-based paints can be used on iron roofs, but first make sure that all rust is treated well, otherwise it may reappear soon after painting.
SUITABLE BRUSHES, ROLLERS AND OTHER EQUIPMENT The brush must have a thick head of filaments to carry the paint. The filament should be 50% longer than the width of the brush and should be soft and springy. Cheaper brushes are cheaper because they have fewer filaments. Rollers are not ideally suited to painting roofs. It is actually better to use a broad brush than a roller, to achieve the correct film thickness. Some additional equipment – handy as well as required: • Sturdy stepladders or scaffolding • Masking tape to cover edges that do not require painting • Plastic sheets or drop sheets, to prevent paint from spilling onto other surfaces • Wire brushes – handy for removing loose paint • A soft dust brush and pan to brush debris off cleaned surfaces • Glass jars for cleaning alkyd brushes in turpentine or ‘thinners’
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Toni Stella, SAPMA Training Manager.
PA I NT S & COATI N G S
• Overalls or old clothes to protect against paint splashes and skin contact with solvents. • Rubber or disposable plastic gloves to protect the hands from solvents and to keep them clean. • Wear a mask and goggles to avoid contact with the eyes and to prevent the inhalation of solvent vapour. • A small plastic bucket to hold cleaning solutions and other liquids. • Choose a suitable paint kettle for hoisting paint up to the roof without spilling it or endangering yourself. • Rope for hoisting paint buckets and other equipment, and to secure yourself to the roof. • Wet cloths. A clean rag, dampened with water, will help clean paint spots as you work. For enamel paint, dampen the cloth with mineral turpentine. • Paint scrapers, which come in various sizes ranging from broad to narrow.
SAPMA CAN HELP The SA Paint Manufacturing Association (SAPMA) strongly recommends making use of only professional, reputable painting contractors to take the stress out of painting your home, office or other building. The association is there to assist and help you find the right contractor for your needs. For more information, call SAPMA on 011 615 1195.
How much does it cost to keep the lights on? Do financial directors and business owners realize how much they are paying to keep the lights on? “In our experience, the answer is an emphatic 'No',” says Relight Energy’s Director, Tristão Abro. “Most financial directors and business owners with whom we have consulted are unaware that they’re overpaying for electricity due to technology inefficiencies, and that there are good, quality lighting solutions that will drastically reduce the bills,” says Abro.
“We know that old lighting technology in the retail sector is costing, on average, R0.08 per hour, per square metre. With a good, quality LED solution, this can easily be reduced to R0.03, equating to a saving of 63%. The savings in the industrial sector is even more – at 80%,” Abro says.
“In fact, there is a certain amount of scepticism and disbelief when we demonstrate that, across various industries, businesses could be saving between 60% and 80% on their energy costs by simply upgrading their lighting technology,” he continues.
The correct lighting design (and auditing) is critical for any business. Old technology is no longer energy efficient or cost effective. Abro says that new, good quality LED technology, while initially more expensive to install, eliminates maintenance costs and can be up to 90% more energy efficient than the older technologies.
Relight Energy is an energy-efficient lighting solutions provider that specializes in LED and skylights for the industrial, retail and commercial sectors. During lighting audits they conduct, Abro says, it becomes clear how companies are resorting to extreme measures in their attempts to lower electricity bills. Common examples include companies removing a number of light bulbs in their warehouses or retail spaces, or simply switching the lights off altogether. “When we began looking into the reasons for this lack of understanding in the markets, we came to the conclusion that business owners and financial directors don’t understand the lighting environment and have been ‘burnt’ by low-quality solutions suppliers – or have been given misinformation.”
JUNE 2016
“It has been calculated that a large, well known South African retail company that owns approximately 100 stores nationally, could be saving approximately R12-million per year by simply upgrading their light fixtures to LED. Many people are still sceptical about these results, but the figures speak for themselves,” Abro states. “Improved lighting solutions and massive savings are at hand. It is high time that companies start investigating different solutions and look to experts in the industry to help them save,” he concludes.
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TI M B E R TRU S S E S
Full marks
Reddam House Somerset is a top-class, prestigious school that focuses on upholding contemporary international trends in education. When Rooftek Trusses was awarded the tender for this roofing project, they accepted the challenge with the promise to deliver an end result that matches the school’s underlying foundation of excellence.
T
he principal design concept of Reddam House Somerset, situated in Somerset West in the Western Cape, was based on an existing school within the group that is located in Waterfall Estate in Midrand, Gauteng. The project comprised three sections, including the Early Learning School centre as well as the Junior Preparatory and Senior Preparatory facilities. When Rooftek Trusses (based in Strand, WC) was asked to submit a tender for the project, they first visited the site in Midrand to assess the scope and requirements. Following a presentation to the principal agent, Rooftek Trusses won the tender.
ENGINEERED DESIGN Although construction elements of Reddam House Somerset were largely based on the existing building in Midrand, the roof design parameters had to be adjusted to suit the Western Cape coastal conditions.
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Due to the geographical location of the site, the impact of high winds on the roofs was another important aspect that had to be taken into account (a factor not as prevalent at the Midrand location). The roof was designed in conjunction with the engineers at the Cape Town branch of MiTek Industries, who also inspected the installation of the roofs to make sure they met all the relevant standards. This 3,500m² project had to be completed within a strict time schedule. Efficient project management was required to coordinate the various phases of manufacture and installation of the roof structure, which included exposed walkways, standard truss runs, as well as the highlight of the project: a 20-metre exposed, vaulted ceiling featuring nail-plated MiTek trusses spanning over the school hall.
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TI M B E R TRU S S E S These trusses differed from the previous school’s design and were designed with the intention of adding some panache to an otherwise ‘ordinary’ school roof. The hall trusses were done as single-section trusses, manufactured at Rooftek’s premises and transported to site – ready to be installed. With each truss made from 76 x 228mm SAP S5 CCAtreated timber and weighing in at approximately 550kg, the manufacture, successful transportation and installation of these 4.8m-high trusses was by no means a small feat. And with the strict deadlines of this project, the procurement of the timber for these abnormal trusses also had to be well managed to prevent any delays. The trusses were designed in such a way that they only transferred vertical loads onto the concrete beams on which they were supported. All horizontal stresses were taken in by the timber and nail plates. Special attention was thus paid to the large forces (+-25kN) that built up in the members of these hall trusses, especially at the ‘bigger than normal’ joints. Sufficient coverage by the MiTek M20 nail plates of the joints was critical to the handling as well as the structural integrity of these large-scale trusses. The end product is a school of international standards, built by specialists of the same standard. For more information, visit www.rooftek.co.za.
PROJECT DETAILS PROJECT: Reddam House Somerset (School in Somerset West, Western Cape ) CLIENT: Century Property Developments CONTRACTOR: Rémey Construction (Pty) Ltd. (Stellenbosch) SUBCONTRACTOR: Rooftek Trusses (Strand) ENGINEERING AND DESIGN INPUT: MiTek Industries (Cape Town Branch) TIMBER USED: SAP S5 CCA-treated
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I N D U S TRY I N S I G HT
Quantity surveyors can boost energy efficiency The quantity surveyor has a major part to play in the pursuit of sustainable, energy-efficient construction, says Larry Feinberg, Executive Director of ASAQS (the Association of South African Quantity Surveyors).
Advising clients on energy conservation now forms part of a quantity surveyor's responsibilities, says Larry Feinberg, Executive Director of ASAQS.
W
ith ever-increasing pressure on developers and property owners to maximize energy efficiency, Feinberg says, it is up to the quantity surveyor to balance the economic equation of sustainability and affordability. “In addition to the traditional role of controlling costs, the QS now also has to guide clients on a wide variety of sustainable aspects of a building project, including: energy conservation, analysing and advising on 'green' capital costs, promoting the benefits of life cycle management, cost-effective sustainable strategies, as well as appropriate financing and leases. Energy efficiency and renewable energy are today regarded as the twin pillars of a sustainable energy policy,” he states.
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“The QS has to set specific targets for the reduction of energy consumed on a building project – by avoiding the use of energyintensive materials as well as restricting embodied energy, which is the total energy required for the extraction, processing, manufacture and delivery of building materials to a building site – whether for retrofit or new projects.” “The QS also has to ensure that minimum energy is used during construction by avoiding over-specification and reducing site labour costs through the use of pre-assembled components wherever possible. He or she also has to ensure that waste levels are controlled and that waste is disposed of responsibly, that water resources are conserved, and that the environment is preserved and enhanced.”
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THERMAL CEILING INSULATION “The SABS has found that if just thermal ceiling insulation and high-performance window systems were introduced today into all new residential and commercial buildings, an astounding 3,500MW of electricity could be saved by 2020.”
“This is almost twice the electricity currently produced by South Africa's Koeberg nuclear power plant. Furthermore, overseas studies have shown that tight building design, including energyefficient windows, well sealed doors and additional thermal insulation of walls, basement slabs and foundations, can reduce heat loss by 25% to 50%.”
I N D U S TRY I N S I G HT
There is still alarming apathy about energy efficiency in South Africa, says ASAQS' Larry Feinberg.
Feinberg says procurement is another important element in sustainable building. “The QS has to ensure that the procurement of materials meets the objectives of stakeholders (such as property developers and occupiers) who are concerned about the sustainability of the components used in the construction or maintenance of the buildings they own or work in. Consequently, the QS has to select and procure renewable energy equipment like solar water heating and other energy-efficient appliances. Companies who build for their own occupation are now increasingly prepared to consider higher expenditure at the outset if it means lower energy bills during the rest of their building's lifespan,” he continues.
“So the quantity surveyor's responsibility in driving sustainable directives is now of national importance. However, while the QS can undoubtedly influence other sectors of the property sector, achieving maximum energy efficiency will need the commitment of the entire industry, including both private and public sectors. There is still an alarming level of apathy and lack of awareness around energy efficiency in South Africa and the need for employing skilled professionals in implementing sustainable building design and execution,” Feinberg adds. For more information, visit www.asaqs.co.za.
Mark the calendar:
ITC-SA Timber Engineered Product Awards The ITC-SA (Institute for Timber Construction), South Africa’s professional regulatory body for the engineered timber structure industry and provider of design, manufacturing, erection, inspection and certification for compliance, will host its Annual Timber Engineered Product Awards on 19 August 2016.
T
he event will celebrate and honour exceptional work by ITC-SA members in the structural timber industry, including roofing, decking and timber frame construction. Project submissions will be judged against specific criteria set out in the competition rules and will be assessed by a professional panel of judges. Lyndsay Cotton, Chairman of the ITC-SA, says, “The Institute of Timber Frame Builders (ITFB), which was incorporated into the ITC-SA three years ago, had a fantastic tradition of hosting its awards to celebrate superior workmanship in the timber construction field. We are delighted to continue this tradition in the ITC-SA and look forward to adding a roofing category to this prestigious event.” The ITC-SA Annual Timber Engineered Product Awards will be hosted at the Expo Centre Nasrec in Johannesburg during Interbuild Africa 2016, where the Institute will also be exhibiting. A formal invitation to the event will be issued in due course.
Cladding and roof detail of House Stephens, built by Logo Homes, which won Gold at the ITC-SA Annual Timber Engineered Product Awards last year, in the ‘Structures larger than 120m2’ category.
For more information, contact Jenni de Waal on 021 845 4435 or at jenni@itc-sa.org.
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Conference
∙ Trade Expo
11 - 12 August 2016 | Cape Town International Convention Centre
Conference
∙ Trade Expo
CLIMBING TO NEW HEIGHTS IN THE WESTERN CAPE’S CONSTRUCTION INDUSTRY What to expect?
3500+ attendees
20+
hours dedicated networking
100+
exhibiting companies
40+
media and association partners
Conference Trade Expo
Conference Trade Expo
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Contact us today to book your space! rashaad.essop@hypenica.com 021 700 4356 Quote SAR
Cape Construction Expo enables you to meet the entire construction value chain, and conclude several months of customer interaction in just a few days.
Join the conversation
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WATE R PROO F I N G
Complex detailing requires special sealant The Nizamiye Masjid is the largest mosque complex in the southern hemisphere, dominating the skyline over Midrand in Gauteng. And when it came to waterproofing its beautiful but intricate dome, all the different shapes and profiles on the substrate surface called for a unique approach. Sika offered the solution.
C
onstructed by Group Five Building in 2012 for the Islamic Institute in Waterfall, the Nizamiye Masjid mosque was funded by a Turkish-born philanthropist and modelled on a 16th century Ottoman mosque in Turkey. It was the intricacy of the dome that led to Sika supplying some of its high-performance waterproofing products for the project. When it was determined that conventional waterproofing was not a viable option for the complex detailing involved, Muhammad Mayet Architects & Urban Designers specified Sika’s Sikalastic MTC 12 paint-on roofing system. Products displaying Sika’s MTC (Moisture Triggered Chemistry) emblem boast proven technology that meets the most stringent international standards. Last winter, TDS Waterproofing was contracted to apply the system comprising Sikalastic-601 BC as base coat, with Sika Reemat Standard and Sikalastic-621 TC as topcoat. Sika Reemat Standard is a glass fibre mat reinforcement for use with Sikalastic-601 BC. Adapting to all the different shapes and profiles on the substrate surface, it not only ensures the correct thickness, but also enhances the crack-bridging properties of the base coat. Sika Reemat Standard is easy and quick to apply and has been tested for use with Sikalastic-601 BC. Both Sikalastic products are cold-applied, highly elastic, crackbridging polyurethane designed to provide easy and quick application. These seamless waterproofing membranes with their moisture-triggered chemistry have the ability to rapidly become water resistant. (This proved beneficial to the contractor, who faced severe time constraints as the project could not be delayed despite heavy rains during applications to the dome.) And with a strong resistance to atmospheric chemicals, both Sikalastic-601 BC and Sikalastic-621 TC are vapour-permeable and emit minimal odour during application. Sikalastic-621 TC is UV stable. By completion of the project, a total surface area of 150m2 was successfully waterproofed. The extensive service life provided by the Sikalastic MTC System has given the Islamic Institute a cost-efficient and durable solution for the dome of their majestic mosque.
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C E I L I N G S & I N S U L ATI O N
City ceiling project aims to warm up homes this winter The City of Cape Town hopes its ambitious ceiling retrofit project will help to warm up even more homes of beneficiaries of old State-subsidized housing projects this winter. The ceilings of more than 3,600 units have already been insulated and weatherproofed.
B
etween 1994 and 2005, the majority of State-subsidized housing units were constructed without insulated ceilings and weatherproofing. This was because the national government subsidy at the time did not make provision for the installation of ceilings. But after 2005, the standard for subsidized housing was improved and the housing subsidy increased to include ceilings, weatherproofing and partitioned bedrooms. “We are expecting to complete some 4,500 ceilings in total by August (ahead of schedule), which will be to the benefit of our more vulnerable residents, especially during the cold and wet winter months,” said the City’s Mayoral Committee Member for Human Settlements, Councillor Benedicta van Minnen. “Having to live without a ceiling has caused much discomfort for residents who are subsequently affected by the poor thermal performance of the homes as well as condensation, which gives rise to damp conditions and inferior internal air quality. This also holds health implications for our residents,” she continued. SA Roofing has previously reported on the progress of this large-scale ceiling retrofit initiative. The latest update is that this first phase of the R133-million overall project, comprising 8,001 units between 2015 and 2017, has been completed in Eureka, Kalkfontein, Broadlands (Strand) and Lwandle. It is also under way and nearing completion in Vrygrond and Wesbank. The second phase of the project is earmarked to start in the second half of 2016, following public participation and community engagement. It is estimated that, in Cape Town alone, there are approximately 40,000 State-subsidized homes without ceilings.
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JUNE 2016
WATE R PROO F I N G
VIP Polyurea chosen to waterproof concrete parking decks a.b.e. Construction Chemicals’ VIP Polyurea coatings have been applied as waterproofing to commercial property parking decks in the Free State and KwaZulu-Natal. a.b.e., part of the Chryso Southern Africa Group, holds an exclusive agreement with Voelkel Industrie Produkte (VIP) in Germany for the local distribution of the Munich company’s acclaimed range of protective coatings and joint fillers that have recently been applied to the parking decks of the Rockville Shopping Centre in Mangaung, Bloemfontein, and also at Umlazi Mega City, south-west of Durban. Cynthia Nel, a.b.e. Branch Manager in Bloemfontein, says VIP Quick Prime and VIP Quick Spray Industrial Polyurea coatings were applied over an area of about 1,400m2 of the parking deck at the new Rockville Shopping Centre by approved a.b.e. applicators, Diamond Linings. The area is used for loading and off-loading by the mainly wholesale operations in the complex serviced by heavy truck deliveries daily. Nel says the concrete floated deck was not initially designed to be an open parking deck, and because it would not have been able to accommodate the weight of sand and pavers after traditional torch-on waterproofing, it was decided to opt for a Polyurea waterproofing option. “Diamond Linings provided slip joints on the surface before applying the VIP Quick Prime Polyurethane water barrier by roller, prior to the application of a topcoat of grey VIP Quick Spray Industrial by means of a high-pressure applicator,” she adds. VIP Quick Spray Industrial is a fast-setting, 100% pure Polyurea elastomer coating with an intricate pore density that provides excellent corrosion protection to all substrates. “The product reacts within seconds and once cured, leaves a flexible and durable rough surface. There were severe time constraints for the Polyurea application, but Diamond Linings managed to prepare the area and apply the product in just five days. The deck was ready for traffic within a few hours afterwards,” Nel states. As for Umlazi Mega City (currently undergoing a R375-million upgrade), Noel Abendroth, a.b.e. Polyurea Coatings Division Manager based in Boksburg, says VIP Polyurea QuickSeal PP350 was applied to seal the expansion joints over a concrete surface area of about 1,200m2 by long-standing a.b.e. approved applicator, Thermoseal, who has just opened operations in KwaZulu-Natal. The protective coating was also applied to the parking deck's flower boxes.
JUNE 2016
a.b.e.'s VIP Polyurea Quick Spray Industrial being applied with a high-pressure applicator by members of the Diamond Linings application team at the new Rockville Shopping Centre near Bloemfontein. VIP QuickSeal PP350 is a spray-applied, instant curing 100% pure Polyurea, flexible membrane that can be built to any thickness in one application – in virtually all environmental conditions. Very cold, very hot or even very humid environments will not affect its curing time or physical performance. VIP QuickSeal PP350 provides flexible, seamless, hard-wearing substrate protection for a wide range of substrates. Its rapid spray application and instant curing characteristics enable shorter shut-down times than traditional glue. Additional features include its fast application time (tack free in seconds – it can be walked on within minutes), high elongation at break, high abrasion resistance and excellent thermal stability, and that it requires no protector boards during back filling.
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I N D U S TRY E V E NT
An event specially for the small and medium contractor In the wake of one of the most challenging economic periods for the building and construction sector, small- to medium-sized building contractors are carving out niche opportunities that were previously more accessible to larger competitors. With competitive pricing and entrepreneurial drive, smaller building and construction companies are making a significant impact on market growth. INTERBUILD AFRICA 2016 Interbuild Africa is one of the largest building and construction trade exhibitions in Africa, and a show that is specifically targeted at the small- to medium-sized building contractor. Taking place at the Nasrec Expo Centre in Johannesburg from 17–20 August 2016, Interbuild Africa will bring an estimated 7,000 industry buyers under one roof for four days to source products and services from more than 300 exhibiting companies. “The vast majority of visitors to the show include company managing directors and business owners, as well as those individuals responsible for procurement – some with purchasing power of up to R10-million,” says Gary Corin, Managing Director of Specialised Exhibitions Montgomery. “Over the years we have also noted a change in the profile of our typical visitors, with a steady increase in the number of architects, civil engineers and independent contractors attending the event,” Corin states. In addition to showcasing the widest range of building and construction materials, equipment, technology and services, Interbuild Africa 2016 will host a free-to-attend seminar theatre where visitors can learn all about the latest trends impacting the sector. Interbuild Africa has also partnered with leading industry bodies to host a number of high-profile conferences and workshops. These supporting partners include: The Association of Architectural Aluminium Manufacturers of South Africa (AAAMSA), Association of South African Quantity Surveyors (ASAQS), and the South African Institute of Architects (SAIA). Interbuild Africa is further endorsed by: Master Builders South Africa (MBSA), National Home Builders Registration Council (NHBRC), Institute of Plumbing South Africa (IOPSA), and the Southern African Light Steel Frame Building Association (SASFA). Interbuild Africa is co-located with four other industry-leading events: Glass Expo Africa, Plumbdrain Africa, EcoAfribuild and Hardex Africa.
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This year will see the launch of Sani'ter, a natural extension of Plumdrain Africa, showcasing the crucial role of water resource management, water quality, waste water management, access, infrastructure, sanitation and developing technologies. Interbuild Africa will also host some new features, including a dedicated A-OSH Expo Pavilion showcasing the widest range of occupational health and safety products, equipment and services.
NEW: WOOD WORLD SOUTH AFRICA Another show making its debut at Interbuild Africa is Wood World South Africa, a dedicated show for the burgeoning woodworking and timber processing industries. In advance of its official launch, Wood World South Africa will be unveiled at a dedicated pavilion by Interbuild Africa organizer Specialised Exhibitions Montgomery, in a joint venture with Hannover Fairs International (Deutsche Messe). “Another positive trend at Interbuild in recent years is the ever-increasing number of international visitors to the show, demonstrating higher numbers in 2014 than at the 2010 and 2012 shows. Interbuild Africa 2014 welcomed more than 300 international visitors from across 46 countries,” says Corin. “This year we’ve focused on increasing this number and we’ve placed great emphasis on attracting more international interest, particularly from other African countries,” he adds. With a legacy spanning over 48 years and the ongoing support of professional industry bodies and associations, Interbuild Africa has become the building and construction exhibition in Africa. Launched in 1968, Interbuild Africa is today the definitive showcase for exhibitors to demonstrate new product launches and innovations. Visitors can pre-register online at www.interbuild.co.za to avoid the queues at the exhibition. To book a stand or discuss a sponsorship package, prospective exhibitors are encouraged to call Roz Nash (Exhibition Manager) on +27 (0)10 003 3072 or email roz@specialised.com.
JUNE 2016